Quote: (Originally Posted by
mempilot)
If I can hold my breath long enough to deploy a second stage during a non-BOV bailout, I can hold my breath long enough to work with a QC.
doesnt that depend entirely on how long it takes to connect the QC? or if at all?
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There is only one QC coupling. A single failure point, and signicantly safer than messing with the p-ports for multiple gas switches for each dive IMO.
not true. You do not have single point failure you have a QC on every bail tank so thats X no, of QCs and Hoses any of those could fail. Single point is on the bov qc and thats what makes it dangerous. If you cant connect in time you will have to come off ffm,
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Higher WOB??? Please explain this. There is no increase in WOB. Pressure is pressure Mike. If I were drawing 120 at the 2nd with 140 at the 1st, I'd agree. That is just not the case. The QC bore is the same as the hose bore. There is no restriction. Maybe there was with gear you have choose to use in the past, but I've actually checked this with my gear selection.
is your QC valved? if so then its going to have a pressure loss. If not then your bov gonna breathe like a dog cos its gonna get full of water every time you disconnect. See previous post on pressure drop V flow and gas density. Every elbow, swivel, y manifold, shut off etc will add a pressure drop (restrict flow). In addition I havent found a BOV that has as good a wob as normal 2nd stage yet, maybe Ive been unlucky with the few Ive used.
ADDED: perhaps I should explain terminology. When I say pressure loss - each component has a pressure loss, even the hoses. That pressure loss is only felt when theres flow (dynamic) so you will only see it when breathing. You can end up maintaining pressure (pressure is the same) but the flow rate is reduced (due to the restrictions/pressure losses) its all inter-related
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A BOV has pluses and minuses. You see the negative outweighing the benefit of the positive. I see the opposite. While the nasal reg is acceptable during non-stress events for me, it is not during stressfull events. I have a deviated septum. I breathe much better through my mouth than my nose. That being said, the nasal is good for a breath here and there, but I wouldn't want to do it for very long. Irritate your sinuses on a long dive, and your nasal BO isn't going to work. Now, you have to unport and report. I do nothing different. We could go at this all day.
So dont use the side reg for bail - I dont. I use it to breathe in the (real) 10 seconds that it takes me to plug in my p-ported 2nd stage.
If you see the p-port no different to your lips then its simple. Oc divers dont generally use switchblock or QC to change regs....why should we? Its really no different at all Bottom line is seperately both me and Matt have experienced difficulties in fast connection of QCs so just suggest that you consider this when determining your bail out methodology